An introduction to AngularJS

Default avatar.
April 10, 2013
An introduction to AngularJS.


When I came across AngularJS a couple weeks ago, I was intrigued at first. By the time I had worked through the set of tutorials available on the AngularJS website, I was thrilled to have found this framework.

What is AngularJS? AngularJS is the (relatively) new kid on the coding block. To quote from their website it is a structural framework for dynamic web apps” which is especially well-suited for building one-page web apps, although it’s certainly not limited to that.

Developed in 2009 by Miško Hevery and Adam Abrons — both Google employees at that time — it is entirely JavaScript and entirely client-side, so anywhere JavaScript can run, AngularJS can run. It’s also small: compressed and minified it’s less than 29 kb. And it’s open source under the MIT license. You can even use the logo, available under the Creative Commons Attribution-ShareAlike 3.0 Unported License.

According to Wikipedia the goal of Angular is to augment browser-based applications with model – view – controller (MVC) capability” and it does just that, providing a binding/​MVC framework. That’s two-way binding, mind you. Delicious. With a structure as simple as {{ my data }}, you bind data to your page. The $scope service detects changes to the model and modifies HTML expressions in the view by way of controllers. Working in the other direction, changes to the view are reflected in the model. This removes the need for the vast majority of data-centric DOM manipulations many of us, myself included, take for granted when working with a library like jQuery.

Angular runs right out of the box with no library dependencies, although it can be extended with the many modules that are available, and of course you can build your own to fit your specific needs. Being pure JavaScript, it also has the benefit of being server-agnostic.

Being accustomed to a powerful library like jQuery, it’s easy to want to mix it in to do things Angular can already do. Recognizing this potential pitfall, the developers have this to say: If you’re struggling to break the habit, consider removing jQuery from your app. Really. Angular has the $http service and powerful directives that make it almost always unnecessary.” One thing is for sure, if you stick to Angular, the jQuery loops and explicit back-and-forth with the server will be absent from your code, since Angular provides such a succinct and clean method of achieving the same things.


Angular uses directives to plug its action into the page. Directives, all prefaced with ng‑, are placed in html attributes.

Some common directives that come pre-built with Angular are:

ng-app: this is essentially the initial entry point of Angular to the page. It tells Angular where it gets to act. <html ng-app> is all it takes to define a page as an Angular application.

ng-bind: changes the text of an element to the value of an expression.
<span ng:bind=“name”></span> will display the value of name’ inside the span. Any changes to name’ are reflected instantly in the DOM anywhere the variable is used.

ng-controller: specifies the JavaScript class for the given action. Controllers are typically kept in external .js files.

ng-repeat: creates the very clean loop structures in your page.

<li ng-repeat="item in items">

effortlessly loops through each item in the collection.

I haven’t used them yet myself, but I have read that creating custom directives can be a tricky issue, something that takes some time to wrap your head around. Angular offers a video to help clarify the concept.

Some sample code

As mentioned before, the ng-app directive in the <html> tag sets the stage for Angular to run in the page.

<html lang="en" ng-app>

Add <script src=“your/path/to/angular/angular.js”></script> to the page head to bring in the Angular framework itself.

<script src=“your/path/to/js/controllers.js”></script> points to the external JavaScript file or files that hold the JavaScript classes your Angular app will call. A very simple class, as an example, might be:

function ItemListCtrl ($scope) {
$scope.items = [
{ "description": "coffee pot" },
{ "description": "nerf gun" },
{ "description": "phone" },

Passing ng-controller ItemListCtrl”, the name of my imaginary JavaScript class, tells Angular what code to run:

<body ng-controller="ItemListCtrl">

and double-bracket notation tells Angular what expressions to evaluate.

ng-repeat is a wonderfully succinct repeater directive that loops through the current collection and does the specified action or provides the specified data. It is so simple and clean.

<p>Stuff on my desk:</p>
<li ng-repeat="item in items">

This simple set up will display:

Stuff on my desk:
coffee pot
nerf gun

Admittedly, that doesn’t seem so impressive, but the idea itself is. Very simple page markup and controllers make getting started with Angular, well, very simple.

Getting real data into your app is pleasingly simple too. Angular likes to consume JSON:

function ItemListCtrl ($scope, $http) {
$http.get(‘items/list.json').success(function (data) {
$scope.items = data;

This returns a JSON object that can manipulated at will in your Angular app.

And it’s built for testing, too!

One of the basic tenets Angular was founded on was that apps built with it be fully testable. For end-to-end testing we have Angular Scenario Runner to simulate user interactions with your app. You feed it scenario tests written in JavaScript.

For debugging in the browser, AngularJS Batarang is a Chrome extension available on github.


As AngularJS gains more traction, more resources will become available, but there are already a number of sites that provide instruction and ways of extending Angular.

The AngularJS site itself, is of course your definitive source. They offer rock-solid, simple tutorials and have a fairly active Google+ presence.

There are a number of Angular repositories on GitHub.

Angular Modules, offers a collection of user-submitted modules, from Backbone services to Rails integration.

Have you used AngularJS yet? How does it compare to much larger libraries like jQuery? Let us know in the comments.

Featured image/​thumbnail, angle image via Shutterstock.

Steve Ralston

Steve Ralston is a web development professional in Waterloo, IA. You can connect with him on LinkedIn. He has just released his first book, Pajamas On Your Feet”, check it out at pajamasonyourfeet​.com

Read Next

15 Best New Fonts, May 2023

The choices you make when selecting a typeface have more impact on your design than almost any other decision, so it’s …

10+ Best Tools & Resources for Web Designers and Agencies (2023 updated)

Having the ability to envision a tastefully designed website (i.e., the role creativity plays) is important. But being …

20 Best New Websites, May 2023

This month, there are tons of great new agency websites to get excited about. 3D animated prisms are a popular theme, a…

How to Find the Right White Label Website Builder for Your Agency

Web design agencies face a lot of obstacles in closing the deal with new clients. One of the most common ones is the ar…

Exciting New Tools For Designers, May 2023

There are hundreds of new tools for designers and developers released each month. We sift through them all to bring you…

3 Essential Design Trends, May 2023

All three of the website design trends here mimic something bigger going on in the tech space, from a desire to have mo…

10 Best AI Tools for Web Designers (2023)

It’s time to stop worrying if AI is going to take your job and instead start using AI to expand the services you can of…

10 Best Marketing Agency Websites (Examples, Inspo, and Templates!)

Marketers are skilled in developing strategies, producing visual assets, writing text with high impact, and optimizing …

15 Best New Fonts, April 2023

Fonts are a designer’s best friend. They add personality to our designs and enable fine typography to elevate the quali…

20 Best New Websites, April 2023

In April’s edition, there’s a whole heap of large-scale, and even full-screen, video. Drone footage is back with a veng…

Exciting New Tools For Designers, April 2023

The AI revolution is having a huge impact on the types of products that are hitting the market, with almost every app b…

3 Essential Design Trends, March 2023

One thing that we often think about design trends is that they are probably good to make a list. That’s not always true…